Ditto streamer was very similar to QIC-MC or Travan unit, and in
fact it could read Travan tapes (could write only to Travan
TR-3). It was another try to make a cheap streamer for an
average home
user. There was one problem: it was painfully slow. Streamers
are slow, yes, but Ditto was much slower than others. 1MB/s, if
you had luck: streamers like constant flow of data, and Ditto
was prone to a "head polishing syndrome" in which the tape moves
back and forth "polishing" the head because data transfer was
too slow to write in constantly moving tape. As it was
not much useful in standard consumer market (backup to one tape
took too much time), it wasn't much popular. See
here for compatibility chart.